<meta charset="utf-8">
(#) Duplicate definitions of resources

!!! ERROR: Duplicate definitions of resources
   This is an error.

Id
:   `DuplicateDefinition`
Summary
:   Duplicate definitions of resources
Severity
:   Error
Category
:   Correctness
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   Initial
Affects
:   Resource files
Editing
:   This check runs on the fly in the IDE editor
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/DuplicateResourceDetector.java)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/DuplicateResourceDetectorTest.java)
Copyright Year
:   2012

You can define a resource multiple times in different resource folders;
that's how string translations are done, for example. However, defining
the same resource more than once in the same resource folder is likely
an error, for example attempting to add a new resource without realizing
that the name is already used, and so on.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/values/strings2.xml:19:Error: wallpaper_instructions has already
been defined in this folder [DuplicateDefinition]
    &lt;string name="wallpaper_instructions"&gt;Tap image to set landscape wallpaper&lt;/string&gt;
            -----------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are the relevant source files:

`res/values/strings.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;!-- Copyright (C) 2007 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
--&gt;

&lt;resources&gt;
    &lt;!-- Home --&gt;
    &lt;string name="home_title"&gt;Home Sample&lt;/string&gt;
    &lt;string name="show_all_apps"&gt;All&lt;/string&gt;

    &lt;!-- Home Menus --&gt;
    &lt;string name="menu_wallpaper"&gt;Wallpaper&lt;/string&gt;
    &lt;string name="menu_search"&gt;Search&lt;/string&gt;
    &lt;string name="menu_settings"&gt;Settings&lt;/string&gt;
    &lt;string name="sample" translatable="false"&gt;Ignore Me&lt;/string&gt;

    &lt;!-- Wallpaper --&gt;
    &lt;string name="wallpaper_instructions"&gt;Tap picture to set portrait wallpaper&lt;/string&gt;
&lt;/resources&gt;

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values/strings2.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;!-- Copyright (C) 2007 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
--&gt;

&lt;resources&gt;
    &lt;!-- Wallpaper --&gt;
    &lt;string name="wallpaper_instructions"&gt;Tap image to set landscape wallpaper&lt;/string&gt;
&lt;/resources&gt;

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values-cs/strings.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;resources xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2"&gt;
    &lt;string name="home_title"&gt;"Domů"&lt;/string&gt;
    &lt;string name="show_all_apps"&gt;"Vše"&lt;/string&gt;
    &lt;string name="menu_wallpaper"&gt;"Tapeta"&lt;/string&gt;
    &lt;string name="menu_search"&gt;"Hledat"&lt;/string&gt;
    &lt;!-- no translation found for menu_settings (1769059051084007158) --&gt;
    &lt;skip /&gt;
    &lt;string name="wallpaper_instructions"&gt;"Klepnutím na obrázek nastavíte tapetu portrétu"&lt;/string&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values/customattr.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;resources&gt;
    &lt;declare-styleable name="ContentFrame"&gt;
        &lt;attr name="content" format="reference" /&gt;
        &lt;attr name="contentId" format="reference" /&gt;
    &lt;/declare-styleable&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values/customattr2.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;resources&gt;
    &lt;declare-styleable name="ContentFrame"&gt;
        &lt;attr name="content" format="reference" /&gt;
        &lt;attr name="contentId" format="reference" /&gt;
    &lt;/declare-styleable&gt;
&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/DuplicateResourceDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `DuplicateResourceDetector.test`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="DuplicateDefinition" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'DuplicateDefinition'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore DuplicateDefinition ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

<!-- Markdeep: --><style class="fallback">body{visibility:hidden;white-space:pre;font-family:monospace}</style><script src="markdeep.min.js" charset="utf-8"></script><script src="https://morgan3d.github.io/markdeep/latest/markdeep.min.js" charset="utf-8"></script><script>window.alreadyProcessedMarkdeep||(document.body.style.visibility="visible")</script>